Portable welding machine



FIG. 1 is an enlarged perspective view of a portable welding machineshowing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevational view taken from the right of FIG. 2, theside opposite being a mirror image thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a rear elevational view thereof.

The ornamental design for a portable welding machine, as shown anddescribed.